The rail to rail voltage is 48V. Each rail presents respectively +/-24V to ground. All voltages are referenced to ground, as usual. Therefore it is more correct to talk about +/-24V because we are talking about a split power supply, and not about a single power supply. These voltages were actually measured on the fully working amplifier and they can go a bit above +/-24V.The total power supply voltage is 47V, not 24V.
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Sorry for the miss understanding....
When I say, "at clipping" I mean that the output is reduced slightly so that it is not clipping.
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